consider moving some extensions to separate libraries

[isaacsas]

Issues like https://github.com/SciML/Catalyst.jl/actions/runs/10549534673/job/29224675728?pr=961 are due to some of the extension libraries we depend on not updating to newer (breaking) releases of packages. In this case I think Homotopy continuation, see https://github.com/JuliaHomotopyContinuation/HomotopyContinuation.jl/issues/581, still being on Arblib .8 instead of 1.X is going to block us from updating DynamicPolynomials, but ultimately Symbolics too (which now also requires DynamicPolynmials 6). Note that this isn't an issue with Arblib just recently making a breaking release, v1.0 came out 10 months ago.

It seems like we might want to move such extensions to be separate libraries (i.e. CatalystHomotopyContinuation or such), which would at least allow Catalyst to get updated for everyone that doesn't need to load HomotopyContinuation.